放电等离子烧结法制备原位TiB增强Ti-6Al-4V复合材料的显微组织特征

来源期刊:中国有色金属学报(英文版)2015年第5期

论文作者:Saeid GHESMATI TABRIZI Abolfazl BABAKHANI Seyed Abdolkarim SAJJADI 吕维洁

文章页码:1460 - 1467

关键词:Ti-6Al-V金属基复合材料;TiB晶须;原位反应;放电等离子烧结法

Key words:Ti-6Al-4V metal matrix composite; TiB whisker; in-situ reaction; spark plasma sintering

摘    要:钛基复合材料在运输和航空工业领域具有广泛的应用。以Ti-6Al-4V和B4C为原料分别采用冷压-真空烧结和放电等离子烧结两种方法制备TiB晶须增强钛基复合材料。考察不同复合材料TiB晶须的分布、大小以及长径比,研究放电等离子烧结温度对TiB晶须增强钛基复合材料的影响。光学显微镜(OM),扫描电镜(SEM)以及EDS分析结果表明:将放电等离子烧结温度从900 °C升高到1100 °C可以使TiB晶须原位自生反应完全,同时减少材料的孔隙含量。

Abstract: Titanium-matrix composites have important and wide applications in the transport and aerospace industries. The current research was focused on powder metallurgy processing of in-situ reinforced titanium-matrix composite with TiB whiskers. The Ti-6Al-4V alloy and B4C additive powders were used as raw materials. Two different consolidation techniques, namely press-and-sintering and spark plasma sintering, were selected. It was observed that in-situ TiB whiskers were formed during sintering in both methods. The changes in size, aspect ratio and distribution of in-situ whiskers in different composite samples were monitored. The effect of spark plasma sintering temperature on the synthesis of in-situ whiskers was also investigated. Based on the microstructural observations (optical microscopy and scanning electron microscopy) and the energy dispersive spectroscopy analysis, it was concluded that increasing the spark plasma sintering temperature from 900 to 1100 °C would lead to the complete formation of in-situ TiB whiskers and reduced porosity content.

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